What is forbidden and what is permissible regarding lineage and affinity

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A man is married and has a daughter from a woman other than his wife. Is his wife’s father a mahram to his daughter by lineage or affinity, or not?
The wife’s father is not a mahram to the daughter of his son-in-law; because there is no relationship between them. In fact, if he wished to marry her, he could do so.Meaning: There is no lineage or affinity between them. Affinity is limited to the ancestors and descendants of the husband and the ancestors and descendants of the wife only. The ancestors and descendants of the husband are forbidden to the wife, and the ancestors and descendants of the wife are forbidden to the husband. These four categories become forbidden, or the prohibition is established, merely by the contract, except for the daughters of the wife, for whom consummation is required.because of His saying, the Exalted:

and your step-daughters under your guardianship [born] of your wives unto whom you have gone in. But if you have not gone in unto them, there is no sin upon you.

وَرَبَائِبُكُمُ اللَّاتِي فِي حُجُورِكُمْ مِنْ نِسَائِكُمُ اللَّاتِي دَخَلْتُمْ بِهِنَّ فَإِنْ لَمْ تَكُونُوا دَخَلْتُمْ بِهِنَّ فَلا جُنَاحَ عَلَيْكُمْ

[al-Nisa: 23] So, if you want to make the matter easy for yourself, look: is he from the ancestors or descendants of the wife, or from the ancestors or descendants of the husband? If he is not, then there is no prohibition.

Source shamela.ws

The Arabic text is copied verbatim from the original source, without any edits.

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